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Re: [csswg-drafts] [css-animation] Motion Blur (#3837)

From: Tab Atkins Jr. via GitHub <sysbot+gh@w3.org>
Date: Fri, 19 Apr 2019 17:32:47 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-484965645-1555695166-sysbot+gh@w3.org>
Yeah, this is about movement specifically; while there are probably variants of motion blur that can do stuff with color, the traditional and widely-understood definition involves tracking how a given pixel moves between frames (calculated from the movement of the object and/or the movement of the "camera", so a pretty easy and quick bit of vector math), and then applying a blur along the direction of motion, proportional to the between-frame velocity.

The only thing in CSS that gives us that sort of tracking ability is tying it to the animation of 'transform' (and its family of properties) specifically. Luckily, that's also the common way to move things around, particularly in situations where you'd *want* motion blur!

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